Sonerila are a diverse group of plants in the Melastomaceae family distinguished by having flowers with three petals (as opposed to five for most other plants in this group).  There seems to be alot of variation within a species, and so the ID of pulchella is a guess.

This Malaysian Sonerila has striking green and pink foliage which just gets more pronounced as the plant matures.  I just got it this year so am not entirely sure how large it gets.

And the flower,

Sonerila pulchella

Sonerila pulchella